The YCombinator-funded DailyBooth has decided to get into the Halloween spirit this year (or is just really good at spotting opportunities for marketing itself) and is running a program that allows users to strut their Halloween stuff using the hashtag #trickortreat.

There’s already a critical mass of users sharing and a commenting on each other’s pics this Halloween Eve, and the momentum has inevitably spread to Twitter. And while the #trickortreat photos do include the ubiquitous assortment of sexy witches and sexy vampires, some of the DailyBooth users have gotten really creative (I’m looking at you Mr.iPad) and I’m including some of my favorites below.

You can view more costumes in realtime here; Link to your favorite (or your own) costumes in the comments.